On Wed, Oct 5, 2016 at 7:15 PM, Pedro Alves <palves@redhat.com> wrote:
> On 10/05/2016 11:57 PM, Jason Merrill wrote:
>> --- a/gcc/c-family/c-opts.c
>> +++ b/gcc/c-family/c-opts.c
>> @@ -1579,6 +1579,7 @@ set_std_cxx1z (int iso)
>> +  flag_elide_constructors = 2;

Oops, that was an earlier version of the patch.  Here's what I checked
in, which doesn't touch flag_elide_constructors.

> Does -fno-elide-constructors have any effect in C++17 mode?
> Should it perhaps be an error, or ignored?

It does have an effect: it avoids open-coding trivial copies.  I
suppose I should update the documentation.

Jason